package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class LoginInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public LoginInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {



        //1.获取请求头中的token
       String token =request.getHeader("authorization");
       if(StrUtil.isBlank(token)){
            //不存在，拦截，返回401状态码
           response.setStatus(401);
           return false;
       }

       String key =RedisConstants.LOGIN_USER_KEY+token;

        Map<Object,Object> userMap =stringRedisTemplate.opsForHash()
                .entries(key);

       if(userMap.isEmpty()){
           response.setStatus(401);
           return false;
       }

        /**
         * 将登陆时存入redis的map 转换为 UserDTO 并保存到ThreadLocal当中
         */
       UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(),false);
       UserHolder.saveUser(userDTO);
       stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
       return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        UserHolder.removeUser();
    }
}
